I guess the number you gave is part of the model number for the spreader. Go to the link below which gives all the measurements for different size chain. Figure out what size chain you have.
Then post on the discussion forum that you need a few links of that size chain. You will get about 10 replys that tell you to buy a 10 ft roll and maybe one that will offer to send you a few links for the cost of the postage. Or you could go to a machinery dealer with a sample link and he will sell you a few for half the cost of a roll.